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The "A" bean implements PropertyChangePublisher so that my FormModel gets
notification when one of its property has changed.
I'd like my FormModel to be notified when a property of a "B" object has changed .
What is the best (cleanest) way to do this ?

Have a look at all sample projects(petclinic, sample) and HeirararchicalFormModel, it should be easy to follow those ulti source codes.
AFAIK Spring RCP manages the rest for you without you needing to fire property changes from the bean which was the way with JGoodies binding.